QIFan-jing,LIYi-bing,ZHAOXu,et al.Preparation of Tungsten-doped g-C3N4 Film Electrode and Its Photoelectric Properties[J].China Water & Wastewater,2022,38(15):61-67.
Preparation of Tungsten-doped g-C3N4 Film Electrode and Its Photoelectric Properties
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第15期
Page:
61-67
Column:
Date of publication:
2022-08-01
- Keywords:
- graphitic carbon nitride (g-C3N4); tungsten doping; film electrode; photoelectric property
- Abstract:
- W/g-C3N4 film electrodes with different tungsten (W) doping contents were prepared by high temperature liquid-based reaction. Then, the film electrodes were characterized by SEM, XRD, FTIR, UV/vis DRS and XPS. The doped tungsten existed in various forms such as W0, WO2 and WO3. The W/g-C3N4 film electrode was used as a photoanode for electrochemical impedance spectroscopy (EIS) test, photocurrent density test and methylene blue degradation experiment. Compared with g-C3N4 film electrode, the photoelectric response of W/g-C3N4 film electrode to visible light was obviously enhanced. When the doping ratio of Na2WO4 and g-C3N4 was 1∶50, the photocurrent density of W/g-C3N4 film electrode was 2.2 times that of g-C3N4 film electrode. The mechanism of W/g-C3N4 film electrode for catalytic oxidation of methylene blue was investigated by adding free radical trapping agent. After doping tungsten, the separation of photoelectron hole pair in W/g-C3N4 film electrode was improved, and the electron migration ability was enhanced. Therefore, more photoelectron migrated faster to the cathode platinum, which was captured by O2 to generate ·O2- and eventually to generate ·OH to degrade methylene blue. In addition, WO3 also had photocatalytic activity to generate photoelectron hole pairs under visible light, and could also provide electrons to be captured by O2 and eventually generate ·OH to degrade methylene blue.
Last Update:
2022-08-01